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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bff9cb4e6945b54e146ffa3d230fe04fd43f3a6a9ed9ef86facf36c0802c252c' 
  AND token = 'ln3tK2SrDyJo2R529LtD0zJLka06ANTwM5/PsALMGJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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