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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '715f8f83c4fedea5eb3a55c70e29d6128b9666e991882ec9f013a2c40b519049' 
  AND token = 'AH4yE93rp0tZN+xiUgj1Evt6uDS1N8y7UdtlRFdKNkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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