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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d7fedd9197850009c17d330f2f9927d6dba358d5a4a5c5b017f7e0cc5001b9' 
  AND token = 'IE/d4o6U8s20x4v1SyfyZfMRe4L1IP8GH0tr3CU5pLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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