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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50f178573a32d4751594d3d528ee940a7757596c166e39251e24daa758997288' 
  AND token = 'Q4re70cW8e2h1oNImtUFP02vmHL5VENaFmWR4++rB04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00185

JSON explain

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