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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ad2d9d14a72365718a08a6ccc764352a544b15d108c40107fd0cce89b785313' 
  AND token = 'KNp/o2AlIabcYJDYUEz8X3m3vzrplylLojiFN5dsVA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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