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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c796022902f2c329a326ac950e29b4abe3bd468f3efb62fbd017210afc288f1' 
  AND token = 'BXCdfXAb5fduhHZH0xuoBjMh5Q2ea+0az1Bf6nt7mFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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