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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d0b5ad66929d58e3806b500ccef706038b26d31444f8fcf0ee6b4fbad65290' 
  AND token = 'WPQ+P28CA1pMOEmVd8tzi2s0Sauvz9dwz4SPvhcrVfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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