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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80a9f3d5f32cac2b3508755cdbc94fd44168879de61df4d0841e86b0fe1a429b' 
  AND token = 'SeeXfyjupWS/ysKXguesnq0IRsub6O5XobrJl/TVhqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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