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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ade9af69af2dacc10c0744ee8924c530da5034008c12cccee5c8457dac074fe' 
  AND token = 'vwmQJir0oSSiTiRBQzGE1Y1BACTtYpL1WN6u/l98PfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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