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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c4a6826c28e91f9fc7238f4aea7194c90be9443fb268fa68a9a02913b7f7ea4' 
  AND token = '6FgP/qdkIcX+McN50XD+M6t139x2ZM8XEVAD/wKekhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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