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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f52f992e94ec4a8a74e976ff55817acce445751c05104d00eb8c6b5ffed26f4f' 
  AND token = 'LKx45e8H5+9KyYljz6E01xni+LLMkI/lBsu5Szo3aUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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