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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd48d8d1ea473b3f5a31cd2b05ffe7f49b4ede2eca3e5878d6e775cdfab3939' 
  AND token = 'ncpNw4ZF4v/TfBRg8DZWT/6NSB8DH5D4nrW9eR6EBt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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