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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '254101d2ba68aa772d6122d9fb5ae5f8b3105722e68fa97bd8fb6c66ba862f7f' 
  AND token = 'VH2RQW94StouCGlVrnJGHaPWXkhZlNPJ8Wc+lbQwJUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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