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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce4c93763860999d6df29f94a05eccbbadaa599c078e64ce29a8eda926edb3a' 
  AND token = '8J7i7QpztRb41fxxYuDK9g4MkVW6Pw1S4uuLm+SFEig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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