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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bfa056703a77a5b52d59ad4f82cf0c029009f3af871b1166d98bc6d55c5e08b' 
  AND token = 'bmILWECnt6ahPdUCYptsoys7ofh8VTt4ZBpLOroqP8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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