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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b29bfd1bddb222ef0afdeca52845d27321978c6b41b0f423e6ad4a3969bece' 
  AND token = 'q5XI8F6mXV203ra2wi/mAIMFHaoxrJ+MWrH9wu4dSnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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