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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27add3f49e2424cd68a28e28964bad98a991c35414bab957c14350e30dd95972' 
  AND token = 'V9/xYE5HR5vFiFc3W9e0OiWyZZMgIwzOduypgDplgTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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