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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ce805474eb092f2984133557d74df75c4e7dc893dc87a73646b4a7bc463503' 
  AND token = 'xubMZ8KDVE8Fih6WTnDg2iTdBUlBz8sIcNj7W9G9LR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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