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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fd1acb3b6db07c87df50fa6dc23af1875d5cd6f05ca03abeaf91afdd29837aa' 
  AND token = 'GF2XFRwYVLHhE7OqW8/SzPkYO7M0MLP9WL62xXyd6Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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