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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff664fde0bf334652784ea5bf57fea4efe05aac7902fb82990e160b19e8f36d1' 
  AND token = 'zntkave/qnQu2TPrNvofTRjZfFyPmleMTpDkzLu/w/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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