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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '763bbf81bd028360530321097350f3fab34cea3bda9128aecac13e54d30d4f6e' 
  AND token = 'dXJH3mi6bC36iW+O2Lc9FiO7LOfyQBnLhz6YFu7kcbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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