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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6396b55a45cd8a3445a174fc01dad69e5fc6e3551e2b32d5a89893e8f6b4ead' 
  AND token = '0COSyxeMESPR2g6MJnGXsfG0hQiZpHfghJXcf6tAKrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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