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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc5a8961fdac6129ad058a546ecdfb850085d7b674f4a7f444219ca331173e7a' 
  AND token = 'FScbNgwVyTvW9lEtB7hH4Ivz/+NbEhbi33hr4VYqa04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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