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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd06a8d6b881ff9ce69c53efb7b2aabc6565e91aa8a4df8c2859dc31ebf5809a' 
  AND token = 'Qij8pv2fCXBXaDDSWb2QEXUb8Q0bSz25JheC1d5ukzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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