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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e2bc9c6db3046a6b72cadbcd98be603bda2b3e670bcd5d6a7ab9e0770be89e2' 
  AND token = 'E2VkfX/LncfUtuEIwfVBlNBsEk40fE7a8eYI50mtGys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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