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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c059c3452d8fcc6294c736e4e395ea2d7f7e8ef5d1545ddd554bee170382238' 
  AND token = 'LfRe5G8gA1JudQM9lMRy4zdcNhnb9Nmecjh3qbrYbpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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