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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec43f2d8eefb2ff0b497281fcb0cbc3d4750408a1497d86a0ab0dc35e35ebe3' 
  AND token = 'KKj0orFheUUiZQsK8IjAvGFDPZMRFqcdN16lXIjkvTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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