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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b9f4851bb245600418b02c64bf21384cd37aba86301c7844227f2d1627c6ad7' 
  AND token = 'e2c8UijD51wYeEtANIr+DzrcoPLhfQCgm9NWrqVJ0cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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