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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa95f6c472516f765c145a79dc959edfbd0cc2c083cac3003d51cdaeeacc48b' 
  AND token = 'UoUoztwT5Ijacgrrm2eK/TFQQJeCSpdo4eFd6363K+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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