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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad25595d6e88eaf0bda05c47755310c2c8b912ddd33550c8dfacf9cd2a4de18e' 
  AND token = '2Bckq3Xli0i+D4u/oHxgrHOpGYzocvxMWCE2hYnp3yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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