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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a33ba56116cf2289a4b57ca3d32b0a179f01c42708a073089d313f4970f6175' 
  AND token = 'WuNHRpGj9l5mVivkTtOn1AIe8ZnNd66oP34xZT1W2iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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