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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76385e2c1ed29e0d8935cc397384d4b446358a9291d1f82d8254db3a12f12d14' 
  AND token = 'KKhlst919NicJIXPn4Eo5hj0wL+9/WVAYBsCfICOt1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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