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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f59877868c551c818fd712762122de11df06c044d03ec419f3390043d119c388' 
  AND token = 'FI/TRhpsBEJyG6/9TeEHPtr64z8vYW7NeCq2Og6/qGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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