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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea64200aef5050c6db26b7868a0c8304c3001d463baa91534c862017e35c27a9' 
  AND token = 'xze6b/6elnVD1962m3LP6BHSw/XkE6oaxISepURvH8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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