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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3178555673430d8484e615d8218b9f4dc8baa0a3d5339bf56e479f01c0c07b47' 
  AND token = 'vgjafXefsGA38pFTGzFaNOJ06MHU0X81rPKeVWGrTTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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