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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b195711ace9ba7e200d68cdb6ee348081920eb12935f0de7c18f3f029598dc7e' 
  AND token = 'RQBHdGUI79KjoMG+PJtFPMcxTo4zShfqr9I/bHbNm48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}