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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eb8ef6e14ce810b78d592d656e255d2135af7c952374e7340ecbd88f8bfe503' 
  AND token = 'W+rBWAyY8IOljq0YqWKLRgnQEokZjxW+TyOeuOHI/14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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