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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10307cbd363f887a9effc9655af776b96db123491d214f02ba39189d77b9b31' 
  AND token = 'Of10EL/mjbjWcdbZzvT+GuUMRCy2Pq6iT9Y0qgu/b1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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