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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f56aa861ad43e64cc89c40b9ae2deb193d6ef42d63f08d83091419c0eb52567' 
  AND token = '6MCXXd1+auh2uxXjqBLZCAXBMlkABLK1eRiw/Chn2RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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