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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a23b8de0166b0573df61766093f463917f7fc950d8e121d0b9c550220887095' 
  AND token = 'fYud9EkzFG4zTMoRodpBNwWXj9AO6fV+bQB62RMfILw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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