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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a87736e3318aa8b73d5b3cc78028138c1dfb46f0a9f824e9c1b7745cb40d75f' 
  AND token = '5aKAmkea+F9uR1GrgN3fQBG0STcX/GxBkIT6Qr5Cv7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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