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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd2942ff5c039f5fd8c5c374b9baa2955b416019b22c97e3695b07559a0e760' 
  AND token = 'V7gvZZIC1PDlORTXqq3ZNxO9bidis96Sb95oZpfS0Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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