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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1015cf7fc56708ed76fcde03cd1665525d06c8ad5b0cd02477a9ef260730d5ca' 
  AND token = '8Cjb7aB0A4BXnOIJcYQmCCc+jSAdeBpExEFa5XcnwEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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