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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a2f72542275b6603abec9f1c9c22f1f9d81bdd76a5584ee059b0a1c0703add' 
  AND token = '7sRF9AV8P3GRyMDQpHXfGlXuhCaqVx1EqutfUPtSlQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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