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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c7782666cbd8edbd2b64569b847e28c2b0cb4e763ac19550767c9ae8df69957' 
  AND token = 'IzkelqKwP0PqZO/JNCvMLCmxLdZSsOMKC5LS3WAlEPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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