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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa92c334f78c57007626a9a5d732260d0cfc17a0d50048ed8fb478d3d3ddbde5' 
  AND token = 'OdqJDTBuE3X4pznhBU7B38O0k0D0DqMgBf7iymNrDzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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