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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87eb8fb31b6656b4cded9fe3241d9a56341ccff6dc267809ecbf2c44bf1e87b1' 
  AND token = 's94k0kM7QL+13ecrQH08abebwfjoKUEayNXngcJAYtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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