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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea9637f8427e3a1baafeb5bbde0b396a2c82fca0d1e9b46f0ab2a53949f0595' 
  AND token = '7HntICLdzBAMJi5VzVPzFarJffa8W8GuiO83SCzDqpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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