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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8097738bf686d7345876a59259e0b7545c6a344f6c252a9a298dfd4c79ea435' 
  AND token = 'kgnZIMdrOJd0mUu9pVA6YnjH5AM1lPf5EJHhpZ2AcPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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