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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4b37120e2e6eabc3a31d8e8cc71c61cefc7d7a3bb9a92d529a66f32e34e44d' 
  AND token = '6SiqHEAr9Q/p79tJaL5TLk2RffkHcIaSyDvptG6Fxlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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