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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb59e8709b90f35b708b68b53183dab940a888bc8477c56fb531fcb32bab599c' 
  AND token = 'EqoL7Yfw0lG6HVB0/sD0fsj9C0BoI7pPYwQNvjyVUIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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