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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d327632d1b1d0d67c5bbda8304134a494f2ec9c5278891c20be5556f74c1b03' 
  AND token = '9CkhI13JPkLtWqzkhjyxKfe0a85/iZP5DR4zVvmUyyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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