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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c8f4629ab68e719f8a7cb4129971b3da778a631bdd6ca3b195f09aed8c154c7' 
  AND token = 'A4dfY4cwHW1wJieERM0pTA63W3T5T/Sg3SAv7Q5EFyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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