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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b7e916baec6b031a0d2f08388a40c5282c55e8864454e4dcbccf0424ce75070' 
  AND token = 'JeaTQsQ3AKWqoVB8rh9iDaSuQI5JI9BGRY9xPG0JKDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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