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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c96b05b39af3c6bf732b9015fd01d3e8344a5e8a7f2b1f777617885b38701a7' 
  AND token = 'GTUyyhD8OE39sMvpJu/rWc6P6a83Wc+nujY5JX0IGzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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