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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7439dede9c1fef059b169aa7aad7cb53a5a0851388827765b18e9efbd5faf48d' 
  AND token = '7owbwtxEGdukfNin33wfFZXdnkm4yw0oiWEND6TLHw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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